Release app version 2.4.0 with API version 2.4.0

Change-Id: I61ea24a157ed244a48a153e6d148b96629e89e45
diff --git a/api/pom.xml b/api/pom.xml
index f7dab45..50a7cf6 100644
--- a/api/pom.xml
+++ b/api/pom.xml
@@ -22,7 +22,7 @@
     <parent>
         <groupId>org.opencord</groupId>
         <artifactId>bng</artifactId>
-        <version>2.4.0-SNAPSHOT</version>
+        <version>2.4.0</version>
         <relativePath>../pom.xml</relativePath>
     </parent>